331221332 has 24 divisors (see below), whose sum is σ = 631247400. Its totient is φ = 151151616.

The previous prime is 331221307. The next prime is 331221337. The reversal of 331221332 is 233122133.

It can be written as a sum of positive squares in 4 ways, for example, as 11383876 + 319837456 = 3374^2 + 17884^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331221337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31157 + ... + 40412.

It is an arithmetic number, because the mean of its divisors is an integer number (26301975).

Almost surely, 2^331221332 is an apocalyptic number.

It is an amenable number.

331221332 is a deficient number, since it is larger than the sum of its proper divisors (300026068).

331221332 is a wasteful number, since it uses less digits than its factorization.

331221332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71675 (or 71673 counting only the distinct ones).

The product of its digits is 648, while the sum is 20.

The square root of 331221332 is about 18199.4871356310. The cubic root of 331221332 is about 691.8937907096.

Adding to 331221332 its reverse (233122133), we get a palindrome (564343465).

It can be divided in two parts, 33122133 and 2, that multiplied together give a palindrome (66244266).

The spelling of 331221332 in words is "three hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-two".